Synchronous motor clock



oct. 1o, 1933. w. A. SPEAR? 1,930,288

SYNCHRONOUS MOTOR CLOCK Filed Nov. 17. 1930 atented Oct. 10, 1933 y *UNITED sfm'lrssY PATENT OFFICE 1,930,288 sYNcHnoNoUs Moron croci;

Walter A. Spear, Cincinnati, Ohio, assignor, by mesne assignments, to Victor Electric Products, Inc., Cincinnati, Chio, a corporation of Ohio Application November 17, 1930 Serial No. 496,062

a. claims. (ci. 584-265 My invention relates to a synchronous motor` cup member C and a lid or front C1 therefor, the or alternating current clock, andh'a's for onebbedges of the members C and C1 being secured toject the provision of a clock which may beopergether, for example soldered, as` at C3. Posiated by a synchronous motor in ,circuit with a tioned within the housing C is the rotor proper commercial source or supply of alternating c ur- C3 of the synchronous 'motor clock; This rotor 60 rent. One object of my invention is the provibeing indicated as having a plurality of teeth C* sion of such a clock which shall be sightly and opposed to the teeth C6 on the pole pieces C5 secbmpact, which shall take up a small space, for cured to and in effect forming part of the pole example upon a des/k.4 Another object is the pieces B1. The inner pole pieces C5 are posiprovision of such a clock in which a narrow case tioned inside of the housing C, which are con- 65 or housing may be employed. Another object is nected to the exterior pole pieces, for example the provision of improved time indicating means.. by bolts or rivets C7. The relation of the inner Another object is the provision of an improved ,pole pieces C5 and the rotor C3 will be clearmultiple drum for the time indicating device. from Figure 4. The rotor C3 is'mounted on'a Cther-A objects will appear from time to time in shaft C5 rotatingVV insuitableV Vbearings C9 and v70 the course of the specification and claims. terminating,"'exteriorly of the housing C, in a I illustrate my invention moreor'l'ess diagramknurled knob C11. This knob is positioned ex` rnatically in the acco/inpanying drawing, whereteriorly of the panel A2, the panel being aperinf f//p/ tui-ed as at. C11 to permit its passage theref m/FigureI/is a front elevation with parts broken through. ,p 75 away; D is a pinion on the rod C" in mesh with a Figure 2 is a section on'the line 2-2 of Figgear' D1 onthe shaft D3. The details of the ure 1; y clock mechanism orv train of gears herein shown Figure 3 is a section on the line 3-3 of Figure do not of themselves form part of the present in- 2; and vention, but it will be understood that through 80' Figure 4 i's a section on the line 4--4 of Fig- 'the train of gears, including the pinion D, the ure 3. ,y gear D1 and other pinions D3 and gearsD1 on the Like partsA are vindicated by like symbols shafts ,D3 and D5 respectively, rotation of the throughout the specification and drawing. rotor C3 and the shaft C11 effects rotation of the Referring to the drawing, A generally indicates drum D5. The gearsl D1 and associated pinions 35 a clock base on which may be mounted a hous- D3 are looselyv mounted upon the shafts D2 D5. ing `structure which includes side panels A1A, In mesh with one of theN pinons D3 upon the connected by an arcuate intermediate wall A3. l,shaft D5 is the gear Dlflxed in relation with Overlying said wall is a front and rear .panel or,` the shaft D2. Mounted for rotation with the strip4 A? having inturned end s A5 which may be. shaft D11 exterior of the housing C is the driving 90 secured to the base-as by the bolts- A5. It will be pinion DB in mesh with the gear D3 upon the understood that the surrounding strip A.V4 clamps stub shaft D19. The final driving connection is the housing structurewhich includes the panels through the associated pinionD11 meshingwith A1 A2 and arcuate wall A3 upon the base A. lI ilthe gear D12 fixed in relation to the Asleeve D13 4Q lustrate the edges oi the, panels A1 A3 as rolled whichserves to support and center the drum D*1 95 over as at A'I which project beyond the edges of and x its axis of rotation. The sleeve D13 is the strip A4. A8 is an indicating aperture in one mounted upon and free torotate independently side of the panel A1. An aperture A10 in the wall of rotation of the shaft D3. The above described l A3 is in register with the aperture A5. I v drum D5 is equivalent Ato the hour hand ofthe Positioned on the inner vface 'of the panelA2 ordinary clock. To provide a more rapidly ro- 100 are a plurality ofv relatively thick plates B, to tating 'drum' which shall vbe the equivalent of which may be secured combined pole pieces and a minute hand, I provide the additional drum E clockl supports B1, the pole pieces being provided which is mounted directly upon the shaft D"1 with angles or outwardly projecting offsets B2 and rotates with it in contrast to the loose at'their lower ends, connected by the laminated mounting of the drum D6 about the shaft D2. In 105 member B3, about which is the coil B1 in circuit order to provide two parallel drums of like as by conductive lines B5 B5 with any suitable radius, 4I prov'ide for the drum E a cylindrical source of alternating current. drum iiange E1 which lies withinor about the Secured to the upper ends of the pole pieces B1 reduced portion 'E11 of the drum D5. The drum is an oil-tight housing, including the housing or D is provided. with a portion E3 of like radius 110 as the drum portion E1, which is connected by the offset portion or shoulder E4 with the reduced drum portion E2. An additional indicating aperture E5 is provided, adjacent the hour indicating aperture A8. It will be understood that the 'time indicating symbols D1E differ on the two drums, the hour symbol, for example, being positioned upon the drum portion E3, and the minute symbol on the drum portion E1. I may, if desired, form the hour aperture A8 longer than the minute aperture, since the desired time of exposure of any individual hour symbol is greater than the time of exposure of any individual minute symbol. Or, if desired, the apertures may be made of the same length. The shaft D2 is also provided with an exterior knob D14, whereby a more-rapid rotation or the drums may be provided than is obtained through the normal rotation of the rotor C3. This per! mits the setting of the drums at any desired position, and thus permits setting o the time indicating means, when correction is necessary.

It will be realized that whereas 'i have described and shown a practical and operative device, nevertheless many changes may be made in size, shape, number and distribution of parts. I therefore Wish my drawing and description to be taken as in. a broad sense illustrative and diagrammatic, rather than as limiting me to the precise features and limitations herein described and shown. In particular l wish it to be understood that the precise details of the synchronous motor herein shown do not of themselves form part of the present invention, and I do not wish my present invention to be limited to -time indicating symbols D15 in line with the apertures A8 and E5. Assuming that one drum may be marked to indicate the passage of twelve hours and the other to mark the passage of sixty minutes, the device may be geared to cause `one complete rotation-of the drum E3 every twelve hours and a complete rotation of use with a synchronous motor elocl; orVV use the drum E1 every hour. However, with appropriate markings, the drums may be caused to complete their rotation with a shorter or a longer period, depending upon the lapse of time to be indicated. The alternating current motor may be launched, for example by manual rotation of the knob C10, and if launched at a speed approximately that or somewhat greater than synchronous, it will continue rotation indeiinitely unless and until the circuit through the coil B4 is interrupted or broken. In order to set the drum, for example to compensatev a stoppage of the clock, the operator rotates a knob D14 which effects a rather rapid rotation of the drum and vpermits it to be readily set.

One important advantage of my device is its compactness. The outer casing, including the panels A1 and A2 and the strip A4, conforms closely in form and in size to the drums E1 E3, which rotate therewithin.

i claim.:

l. In a clock, a base, a clock case mounted on said base having nat side walls, pole pieces carried by said base and extending upwardly Within the case parallel with and adjacent to one of said side walls, a clock train and an oiltight housing therefor carried by said pole pieces and projecting therefrom toward the other Ihat wall of the clock case, a driven shaft through said housing, a plurality of indicating drums on said shaft and means for rotating them at different speeds.

2. In a clock, a base, a cloolr case mounted on said base having at side Walls, pole pieces carried by said. base and extending upwardly V-fivitlpin the case adjacent to vone of said side wallsfa clock train and an oil-tight housing therefor carried by said pole pieces and projecting therefrom toward the other flat Wall of the clocl; case, a driven shaft through said housing, a plurality of indicating drums on said shaft and means for lrotating thernat different speeds.

3. Ln a clock, a base, a clock case mounted on said base having at side walls, pole pieces carried by said base and extending upwardly within the case parallel wit .nd adjacent to one of said side `walls, a clocirvtrain and an oil-tight housing therefor carried by said pole pieces and projecting therefrom toward the other flat Wall of the clock case, a driven shaft through said housing, a plurality or indicating drums on said shaft between the fiat Walls of the case, and means for rotating them at diierent speeds.

WALTER A. SPEAR. 

